Mike:
Two ways:
1. External Overview Pyramid
- see http://mapserver.org/input/raster.html#rasters-and-tile-indexing
and
http://mapserver.org/input/raster.html#raster-display-performance-tips
- Make image pyramid levels with gdal_translate
- create tile indexes for each level of pyramid with gdaltindex
- add one LAYER entry in your map file for each level of your pyramid (and
carefully select a MIN/MAXSCALEDENOM for each)
or
2. Internal Overviews
- create a GDAL VRT file with gdalbuildvrt
- create image overviews with gdaladdo
- add only one LAYER to your map file referencing the VRT file (and let GDAL
figure out the pyramids)
I haven't tried the second approach but it sounds interesting.
Best Regards,
Brent Fraser
Mike Quentel wrote:
I meant gdaladdo for the pyramids (of GeoTIFF).
Mike Quentel
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Mike Quentel
*Sent:* 18 August 2010 11:45
*To:* MapServer Users
*Subject:* [mapserver-users] How do I configure Mapfile to use image
pyramids
How do I configure the Mapfile to point to image pyramids? Does
Mapserver automagically recognise pyramids? Do I simply generate my
pyramids of GeoTIFF images using gdal_translate, then point to a tile
index in the Mapfile?
Sorry if this is the Nth time someone has asked this question, but
oddly, it does not explicitly appear anywhere obvious on the web site,
nor in the manual. If so, please point it out (eg: “you can find the
information about using pyramids on page # of the manual, or at this
link ____”). I have tried doing a search for the term “pyramid” in the
manual; nothing returned. Wish there were a chapter subheading under
Data Input-->Raster Data--> “Using Pyramids”.
Many thanks.
Mike Quentel
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